Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd439c881e81f87c…

MALICIOUS

PDF

81.1 KB Created: 2021-06-13 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c4242154e1bd564d6a31180637f7ade4 SHA-1: 86fa4dad905730aef8a3afe0d9fcb0afe1bd4740 SHA-256: bd439c881e81f87c48d7a7bccff6739dbe6495bb110fee43881e2b12c15a3732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs and is identified as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The presence of the string 'Ringtone tere bin ab na lenge' in the document body further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=ringtone+tere+bin+ab+na+lenge PDF link annotation
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c94c9f3baea1437f745033071a2abe6b/zavexikovesonopiziluwezi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/51191994009.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/v6qln02qn8qbqvtbqeatmdcc6p/78519749216.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c849c1a6---dufuvawer.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdf25312b---manipikagaronezixegiw.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ml6glfhkmh4vo3rp7abtshh192/55661203874.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lifilo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fa0ddb0ff4b99788b6808a64e672c22d/xulezoxapeve.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/baae8e822936380cd068e21e582c4dcd/1533855496.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105261022.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc042686ff---27507911059.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b63ad2a2966---jesozafo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/49935211165.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bbf35ead---12950991508.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/wifuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 4820 bytes
SHA-256: 0adb77169c1b4863c12e750c2b1b2af942033866043f841af1fcef0a699e0fd1
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 10648 bytes
SHA-256: bedb8b311150649131b1f6e99e8b449140fb456879657330d967636dd6d88c59
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 9092 bytes
SHA-256: aede48470b05952973cc87d0a2c64ffed44824b5b05d16d621aae8727019e72b